msm: mdss: idle power collapse notify

This fix adds notification of idle power collapse to user space
for cmd mode panels. Without this fix user space has no
knowledge of reprogramming the QSEED3 LUTs after idle power
collapse, this needs to be done with the user space knowledge
to keep it's LUT bank offset in sync with the HW used LUT bank
offset.

Change-Id: Ia1fbd07da8c8c854a74cf5dad62f5ec2d1fc962e
Signed-off-by: Abhijit Kulkarni <kabhijit@codeaurora.org>

3 files changed, 40 insertions, 0 deletions

diff --git a/drivers/video/fbdev/msm/mdss_fb.c b/drivers/video/fbdev/msm/mdss_fb.c
index a183fd7cd247..0f179c8f6ad5 100644
--- a/drivers/video/fbdev/msm/mdss_fb.c
+++ b/drivers/video/fbdev/msm/mdss_fb.c
@@ -892,6 +892,12 @@ static ssize_t mdss_fb_get_persist_mode(struct device *dev,
 	return ret;
 }
 
+static ssize_t mdss_fb_idle_pc_notify(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	return scnprintf(buf, PAGE_SIZE, "idle power collapsed\n");
+}
+
 static DEVICE_ATTR(msm_fb_type, S_IRUGO, mdss_fb_get_type, NULL);
 static DEVICE_ATTR(msm_fb_split, S_IRUGO | S_IWUSR, mdss_fb_show_split,
 					mdss_fb_store_split);
@@ -912,6 +918,8 @@ static DEVICE_ATTR(measured_fps, S_IRUGO | S_IWUSR | S_IWGRP,
 	mdss_fb_get_fps_info, NULL);
 static DEVICE_ATTR(msm_fb_persist_mode, S_IRUGO | S_IWUSR,
 	mdss_fb_get_persist_mode, mdss_fb_change_persist_mode);
+static DEVICE_ATTR(idle_power_collapse, S_IRUGO, mdss_fb_idle_pc_notify, NULL);
+
 static struct attribute *mdss_fb_attrs[] = {
 	&dev_attr_msm_fb_type.attr,
 	&dev_attr_msm_fb_split.attr,
@@ -925,6 +933,7 @@ static struct attribute *mdss_fb_attrs[] = {
 	&dev_attr_msm_fb_dfps_mode.attr,
 	&dev_attr_measured_fps.attr,
 	&dev_attr_msm_fb_persist_mode.attr,
+	&dev_attr_idle_power_collapse.attr,
 	NULL,
 };
 
@@ -5177,3 +5186,16 @@ void mdss_fb_calc_fps(struct msm_fb_data_type *mfd)
 		mfd->fps_info.frame_count = 0;
 	}
 }
+
+void mdss_fb_idle_pc(struct msm_fb_data_type *mfd)
+{
+	struct mdss_overlay_private *mdp5_data = mfd_to_mdp5_data(mfd);
+
+	if (mdss_fb_is_power_off(mfd))
+		return;
+
+	if ((mfd->panel_info->type == MIPI_CMD_PANEL) && mdp5_data) {
+		pr_debug("Notify fb%d idle power collapsed\n", mfd->index);
+		sysfs_notify(&mfd->fbi->dev->kobj, NULL, "idle_power_collapse");
+	}
+}
diff --git a/drivers/video/fbdev/msm/mdss_fb.h b/drivers/video/fbdev/msm/mdss_fb.h
index 111d7cfc7c9a..d64580a35775 100644
--- a/drivers/video/fbdev/msm/mdss_fb.h
+++ b/drivers/video/fbdev/msm/mdss_fb.h
@@ -468,4 +468,5 @@ void mdss_fb_report_panel_dead(struct msm_fb_data_type *mfd);
 void mdss_panelinfo_to_fb_var(struct mdss_panel_info *pinfo,
 						struct fb_var_screeninfo *var);
 void mdss_fb_calc_fps(struct msm_fb_data_type *mfd);
+void mdss_fb_idle_pc(struct msm_fb_data_type *mfd);
 #endif /* MDSS_FB_H */
diff --git a/drivers/video/fbdev/msm/mdss_mdp.c b/drivers/video/fbdev/msm/mdss_mdp.c
index 37a3876d3570..c54e51b06280 100644
--- a/drivers/video/fbdev/msm/mdss_mdp.c
+++ b/drivers/video/fbdev/msm/mdss_mdp.c
@@ -5049,6 +5049,22 @@ vreg_set_voltage_fail:
 }
 
 /**
+ * mdss_mdp_notify_idle_pc() - Notify fb driver of idle power collapse
+ * @mdata: MDP private data
+ *
+ * This function is called if there are active overlays.
+ */
+static void mdss_mdp_notify_idle_pc(struct mdss_data_type *mdata)
+{
+	int i;
+
+	for (i = 0; i < mdata->nctl; i++)
+		if ((mdata->ctl_off[i].ref_cnt) &&
+			!mdss_mdp_ctl_is_power_off(&mdata->ctl_off[i]))
+			mdss_fb_idle_pc(mdata->ctl_off[i].mfd);
+}
+
+/**
  * mdss_mdp_footswitch_ctrl() - Disable/enable MDSS GDSC and CX/Batfet rails
  * @mdata: MDP private data
  * @on: 1 to turn on footswitch, 0 to turn off footswitch
@@ -5112,6 +5128,7 @@ static void mdss_mdp_footswitch_ctrl(struct mdss_data_type *mdata, int on)
 				mdss_mdp_memory_retention_ctrl(MEM_RETAIN_ON,
 					PERIPH_RETAIN_OFF);
 				mdata->idle_pc = true;
+				mdss_mdp_notify_idle_pc(mdata);
 				pr_debug("idle pc. active overlays=%d\n",
 					active_cnt);
 			} else {